Reproductive Success and Soil Seed Bank Characteristics of <em>Astragalus ampullarioides</em> and <em>A. holmgreniorum</em> (Fabaceae): Two Rare Endemics of Southwestern Utah

Astragalus ampullarioides and A. holmgreniorum are two rare endemics of southwestern Utah. Over two consecutive field seasons (2009-2010) we examined pre-emergent reproductive success, based on F/F and S/O ratios, from populations of both Astragalus ampullarioides and A. holmgreniorum, estimated the...

Full description

Bibliographic Details
Main Author: Searle, Allyson B.
Format: Others
Published: BYU ScholarsArchive 2011
Subjects:
Online Access:https://scholarsarchive.byu.edu/etd/3044
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4043&amp;context=etd
id ndltd-BGMYU2-oai-scholarsarchive.byu.edu-etd-4043
record_format oai_dc
spelling ndltd-BGMYU2-oai-scholarsarchive.byu.edu-etd-40432019-05-16T03:24:57Z Reproductive Success and Soil Seed Bank Characteristics of <em>Astragalus ampullarioides</em> and <em>A. holmgreniorum</em> (Fabaceae): Two Rare Endemics of Southwestern Utah Searle, Allyson B. Astragalus ampullarioides and A. holmgreniorum are two rare endemics of southwestern Utah. Over two consecutive field seasons (2009-2010) we examined pre-emergent reproductive success, based on F/F and S/O ratios, from populations of both Astragalus ampullarioides and A. holmgreniorum, estimated the density of the soil seed bank of A. holmgreniorum as a measure of potential post-emergent reproductive success, and estimated seed persistence within the soil seed bank. Fruit/flower (F/F) ratios and seed/ovule (S/O) ratios varied significantly between populations and among years in both species, and showed low reproductive output in both taxa. In Astragalus ampullarioides F/F and S/O were 0.06±0.01 and 0.16±0.02, respectively (2009), and 0.14±0.01 and 0.41±0.02, respectively (2010). For Astragalus holmgreniorum F/F and S/O ratios were 0.11±0.01 and 0.38±0.02, respectively (2009), and 0.23±0.01 and 0.66±0.02, respectively (2010). Although Astragalus holmgreniorum exhibited a low soil seed bank density (4.3 seeds m-2), seed persistence data showed low a low percentage of seeds germinated during the first year in the soil seed bank. Seeds remaining in the seed bank maintained high percent viability. Soil seed persistence of Astragalus ampullarioides differed from A. holmgreniorum in that a high percentage of seeds germinated during the first year in the soil seed bank. A high percentage of viability in ungerminated seeds was also maintained in A. ampullarioides. Although these species differ in life histories and dependence on soil seed banks, an understanding of the strategies unique to each species will prove useful in management plans. 2011-07-06T07:00:00Z text application/pdf https://scholarsarchive.byu.edu/etd/3044 https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4043&amp;context=etd http://lib.byu.edu/about/copyright/ All Theses and Dissertations BYU ScholarsArchive Fruit/flower ratio seed/ovule ratio Astragalus endangered species seed bank seed persistence milkvetch Animal Sciences
collection NDLTD
format Others
sources NDLTD
topic Fruit/flower ratio
seed/ovule ratio
Astragalus
endangered species
seed bank
seed persistence
milkvetch
Animal Sciences
spellingShingle Fruit/flower ratio
seed/ovule ratio
Astragalus
endangered species
seed bank
seed persistence
milkvetch
Animal Sciences
Searle, Allyson B.
Reproductive Success and Soil Seed Bank Characteristics of <em>Astragalus ampullarioides</em> and <em>A. holmgreniorum</em> (Fabaceae): Two Rare Endemics of Southwestern Utah
description Astragalus ampullarioides and A. holmgreniorum are two rare endemics of southwestern Utah. Over two consecutive field seasons (2009-2010) we examined pre-emergent reproductive success, based on F/F and S/O ratios, from populations of both Astragalus ampullarioides and A. holmgreniorum, estimated the density of the soil seed bank of A. holmgreniorum as a measure of potential post-emergent reproductive success, and estimated seed persistence within the soil seed bank. Fruit/flower (F/F) ratios and seed/ovule (S/O) ratios varied significantly between populations and among years in both species, and showed low reproductive output in both taxa. In Astragalus ampullarioides F/F and S/O were 0.06±0.01 and 0.16±0.02, respectively (2009), and 0.14±0.01 and 0.41±0.02, respectively (2010). For Astragalus holmgreniorum F/F and S/O ratios were 0.11±0.01 and 0.38±0.02, respectively (2009), and 0.23±0.01 and 0.66±0.02, respectively (2010). Although Astragalus holmgreniorum exhibited a low soil seed bank density (4.3 seeds m-2), seed persistence data showed low a low percentage of seeds germinated during the first year in the soil seed bank. Seeds remaining in the seed bank maintained high percent viability. Soil seed persistence of Astragalus ampullarioides differed from A. holmgreniorum in that a high percentage of seeds germinated during the first year in the soil seed bank. A high percentage of viability in ungerminated seeds was also maintained in A. ampullarioides. Although these species differ in life histories and dependence on soil seed banks, an understanding of the strategies unique to each species will prove useful in management plans.
author Searle, Allyson B.
author_facet Searle, Allyson B.
author_sort Searle, Allyson B.
title Reproductive Success and Soil Seed Bank Characteristics of <em>Astragalus ampullarioides</em> and <em>A. holmgreniorum</em> (Fabaceae): Two Rare Endemics of Southwestern Utah
title_short Reproductive Success and Soil Seed Bank Characteristics of <em>Astragalus ampullarioides</em> and <em>A. holmgreniorum</em> (Fabaceae): Two Rare Endemics of Southwestern Utah
title_full Reproductive Success and Soil Seed Bank Characteristics of <em>Astragalus ampullarioides</em> and <em>A. holmgreniorum</em> (Fabaceae): Two Rare Endemics of Southwestern Utah
title_fullStr Reproductive Success and Soil Seed Bank Characteristics of <em>Astragalus ampullarioides</em> and <em>A. holmgreniorum</em> (Fabaceae): Two Rare Endemics of Southwestern Utah
title_full_unstemmed Reproductive Success and Soil Seed Bank Characteristics of <em>Astragalus ampullarioides</em> and <em>A. holmgreniorum</em> (Fabaceae): Two Rare Endemics of Southwestern Utah
title_sort reproductive success and soil seed bank characteristics of <em>astragalus ampullarioides</em> and <em>a. holmgreniorum</em> (fabaceae): two rare endemics of southwestern utah
publisher BYU ScholarsArchive
publishDate 2011
url https://scholarsarchive.byu.edu/etd/3044
https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4043&amp;context=etd
work_keys_str_mv AT searleallysonb reproductivesuccessandsoilseedbankcharacteristicsofemastragalusampullarioidesemandemaholmgreniorumemfabaceaetworareendemicsofsouthwesternutah
_version_ 1719185881579913216